Water supply and treatment

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20 Chemical Treatment Processes Page 2 of 12 For decades the challenge has
existed in the defining of an unstable water and ... Selected references on current
procedures are presented in the Supplemental Data. ... AWWA Manual, Chapters
14 and 12. ... If the water in Problem 20P-1 is passed through a residential water
softener of the ion exchange type answer the questions asked in Problem 20P-1.